The drug plants of Illinois drugplantsofilli44teho Year: 1951 ERIGERON CANADENSIS L. Can- ada fleabane, mare's-tail, horse-weed, bitter-weed, hog-weed. Compositae.— An erect, unbranched, bristly hairy herb 6 inches to 6 feet tall, annual; stem wand- like; leaves somewhat hairy, alternate, the lower spatulate, petioled, and dentate, the upper linear-lanceolate, sessile, often en- tire; flower heads greenish-white, small, very numerous, in panicled clusters on numerous axillary and terminal floral branches at the top of the plant. The leaves and tops are collected while the plant is in bloom.
The drug plants of Illinois drugplantsofilli44teho Year: 1951 ERIGERON CANADENSIS L. Can- ada fleabane, mare's-tail, horse-weed, bitter-weed, hog-weed. Compositae.— An erect, unbranched, bristly hairy herb 6 inches to 6 feet tall, annual; stem wand- like; leaves somewhat hairy, alternate, the lower spatulate, petioled, and dentate, the upper linear-lanceolate, sessile, often en- tire; flower heads greenish-white, small, very numerous, in panicled clusters on numerous axillary and terminal floral branches at the top of the plant. The leaves and tops are collected while the plant is in bloom. Common as a weed and frequent in open woods and pastures throughout the state; blossoms from mid- August to mid-September. Contains a volatile oil (oil of fleabane), tannin, gallic acid, and a bitter extractive. Used as a diuretic, tonic, and astringent. [^Erigeron philadelphicus L., daisy flea- bane, purple-flowered and blossoming in May and June, is collected as other Erigeron species and contains the same volatile oil.] ERYNGIUM AQUATIGUM L. But- ton snakeroot, eryngo, corn snakeroot, rattlesnake master. Umbelliferae.—An erect, coarse, little-branched herb 2 to 6 feet tall, perennial; rootstock stout, knotty, branched, fibrous-rooted; stem stout, stifiE, furrowed; leaves linear, grass- like, rigid, 1 to 2 feet long, bristly mar- gined, parallel-veined; flowers whitish, small, in dense ovate or conical heads at the ends of the stout branches of a termi- nal inflorescence. The rootstock collected in the fall. In- frequent in damp soil throughout the state. Medicinally effective constituents un- known. Used as a diaphoretic, diuretic, expectorant, and, in large doses, as an emetic.
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